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Nociception

Nociception

Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.

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Related Experiment Video

Updated: Mar 1, 2026

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice

Optogenetic Entrainment of Hippocampal Theta Oscillations in Behaving Mice

Published on: June 29, 2018

Thalamic Bursts Down-regulate Cortical Theta and Nociceptive Behavior.

Brian W LeBlanc^1,2, Brent Cross^1,2, Kelsey A Smith^1,2

¹Department of Neurosurgery, Rhode Island Hospital, Providence, RI, USA.

Scientific Reports

|June 1, 2017

Summary

This summary is machine-generated.

Thalamic neuron bursts reduce pain behaviors by disrupting brainwave activity in the somatosensory cortex. This suggests bursts are an adaptive pain response, decreasing sensory salience.

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Last Updated: Mar 1, 2026

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Area of Science:

Neuroscience
Pain Research
Somatosensory System

Background:

Theta oscillations (4-8 Hz) in the somatosensory cortex are linked to pain perception.
Thalamic neurons play a crucial role in relaying sensory information, including pain signals.

Purpose of the Study:

To investigate the relationship between pain behavior, cortical theta oscillations, and thalamic neuronal activity.
To determine if inducing thalamic bursts can modulate pain responses and associated neural activity.

Main Methods:

In vivo electrophysiological recordings in the somatosensory cortex and thalamus.
Optogenetic stimulation to induce burst firing in thalamic neurons.
Assessment of mechanical allodynia as a measure of pain behavior.

Main Results:

Optically-induced thalamic bursts significantly attenuated mechanical allodynia.
Thalamic bursts were associated with a decrease in theta oscillations within the somatosensory cortex.
This suggests a desynchronization of cortical activity.

Conclusions:

Thalamic burst firing represents an adaptive neural mechanism for pain modulation.
This mechanism functions by desynchronizing cortical theta oscillations, thereby reducing the sensory salience of pain stimuli.